Cylinder hone



Patented Jan. 8, 1929.

PATENT oFriE.

FRANK E. HARTER, OF SEATTLE, wasnmetrg qa CYLINDER HONE.

Application filed April 5,

vThis invention relates to c linder hones, "and-has more particular... re erence to 1mprovements in honesofthe kind set forth in my United States Letters Patent No. 1,498,09, granted June 17, 1924.

As disclosed in my above mentioned patent, cylinder bones of the present kind have heretofore been provided embodying a structure which, as a whole, may be termed a head provided with a plurality of spaced longitudinally disposed peripheral retainers, in each of which is held an abrasive cylinder-surface engaging stick or stone. A serious objection to these prior devices isthat they do not-run smoothly, but chatter and jump due to the drag or reaction of the abrasive sticks on the cylinder surface. I havefound that this objection can be overcome by eliminating certain of the abrasive sticks, but when this alone is done the hone or tool is not effectively restrained against lateral tilting, and an inferior grade of work naturally results. In order to obtain the benefits of eliminating certain of the abrasive sticks, and at the same time provide effective support forthe hone or toolto prevent lateral tilting thereof, in op-- eration, I maintain all of the, stick retainers but provide certain of the same with nonabrasive sticks, and the others with abrasive sticks or stones. In this way a hone or grinder is produced which will run smoothly without chattering or jumping and without in any way affecting the grade of work produced in the use'of thetool with'a given amount of care and skill.

It has further heretofore been the practice to mount the abrasive sticks or stones directly in the retainer so that in case an abrasive stick should become cracked or broken the fragments are capable of independent movement and separation to such an extent as to cause a detrimental eifect upon the work. Ithas been proposed to overcome this effect by rigidly mounting each abrasive stick or stone in a channel-shaped holder adapted to be suitably held'in the associated. recess or retainer of the tool head, the snug support for the stone afforded by this holder being relied upon to minimize breakage. However, in such devices, the stone or stick was designed to be cemented in the holder, the cement affording the only and an unreliable means for maintaining the stone or stick within the holder. In order to minimize breakage to a maximum extent and in a most effective man- 1927. Serial No. 181,040;

'ner, I ii1ount the stones or sticks within a holder so that the holder interlocks with the stone, no cement being used or relied upon. In this way, breakage of the stones is minimized, but in case such breakage should occur the several fragments or parts of the stones Wlll beeifectively retained in proper relation or against relative displacement to such an extent as would cause serious detrimental effects upon the work. 1

It is still further usual in the present class of tools to provide the abrasive sticks or stones with projecting end tongues adapted to be engaged behind stop elements at the ends of the stone retainer recesses, whereby the stones are held in the retainers. However, owing to the frail nature of these reduced extensions, which form an integral part of the brittle abrasive stick or stone, they are easily damaged or broken off so that the stones are free to fall out of the retainer, an occurrence having a serious objection. In order to overcome the above defect, I provide the metal holder with end extensions adapted to project at the ends of the stone and to consti tute the tongues engageable behind the stop means of the retainer so that the stone is effectively maintained in place without liability of the tongues becoming broken off.

A further object is to form the projecting end tongues by angularly return bending end extensions of the base member of the stone holder so that said end extensions of the holder abut the ends of the stone and thereby effectively retain the same against longitudinal displacement relative to or out of the holder.

Other objects will become apparent as the nature of the invention is better understood, and the same consists in the novel form, combination and arrangement of parts herein after more fully described, shownin the accompanying drawings and claimed.

In the drawings, wherein like reference characters indicate corresponding parts throughout the several views,

Figure 1 is a side elevational view showing a hone provided with the present improvements;

Figure 2 is a similar view, partly broken away and showing the hone expanded;

Figure 3 is a horizontal section'taken upon line 33 of Figure 1;

Figure 4 is a horizontal section taken upon line H of Figure 2;

Figure 5 is an end view of one of the abrasive stick or stone holders and its associated stick or stone;

Figure 6 is a perspective view of one of the non-abrasive sticks employed in the construction of Figures 1 to 4 inclusive;

Figure 7 is a horizontal section taken upon line 7-7 of Figure 1 with parts omitted, and illustrating details of the universal detachable driving connection between the tool and a driving shaft;

Figure 8 is a section upon the line 8-8 of Fi ure 1; and I I igure 9 is an elevational view of the driving shaft with its attached male member of the universal and detachable driving connection.

For sake of illiistration, the present improvements have been illustrated as embodied in the form of cylinder hone disclosed in my above mentioned patent, in which the spindle '1 is provided with a washer 5 at its lower end,

a washer 6 adjacent its upper end, and threads extending from the washer 6 to the upper end. The arms 2 are also provided and pivotally mounted on pins 8 between the washers 5 and 6, as well as having recesses 9 in their outer ends in which the cylinder-surface engaging sticks '10 and 10 are held by removable cross pins 11. Further, the springs 12 are also provided in the pockets 13 for holding the sticks outward, while projections 14 are provided on the upper ends of the arms to which links 15 are pivotally held by bolts 16. The inner ends of the links are also pivotally held by the usual bolts 17 to hubs 18 on the lower side of a spider 3 which is adapted to be turned foractuating the links 15 and thereby swinging the arms 2 to expand or contract the tool, the adjustment being maintained by means of a nut 19 threaded on the spindle 1 and adapt ed to be screwed downwardly onto the spider 3. Thus far described, the construction is substantially the same as set forth in my above mentioned patent except that the sticks 10* are of non-abrasive material, and preferably of non-metallic and a yielding nature, such as wood. As" shown, the non-abrasive sticks 10 may alternate with the. abrasive sticks 10, although the disposition of abrasive and non-abrasive sticks in opposed relation may also be resorted to if desired. There are usually four sticks employed at uniform distances apart so that. effective support is had against lateral tiling of the tool when in operation, and with this arrangement two of the sticks are of non-abrasive material and the other two are of abrasive material. With this arrangement, considerable of the usual drag or reaction of the abrasive sticks is eliminated so that the tool will run smoothly and without chattering or jumping.

It is apparent that the recessed outer ends or end members of the arms 2 constitute stick retainers of a grinding head, which, in this ward movement as influenced by the springs 13. The usual way of forming the end tongues is to provide inte ral extensions on the ends of the sticks, and this same procedure is followed in the formation of the non-abrasive or wooden sticks 10 as shown in Figure 6, the end tongues being desi nated at 10.

However, the end tongues for the abrasive -sticks 10 are formed in a different way because they are more likely to be broken off when formed as integral parts of a brittle element such as is characteristic of the stones or abrasive sticks. As shown, the abrasive sticks are provided in the sides thereof with longitudinal grooves that extend from end to end of the stones, and the latter are fitted at their inner portions within sheet metal channel-shaped holders 25, the free longitudinal edge portions which are directed inwardly in the form of flanges 26 engaging snugly in the side grooves of the assoclated stones orabrasive sticks. In this way, the stone is effectively held in the holder and should the stone become cracked or broken, the several fragments will be maintained against relative displacement due to the interlocking engagement of the holder with the stone provided by the projection of the flanges 26 into the.

side grooves of the stone as shown in Figure 4. The base or intermediate portion of each holder is provided at its ends with extensions which are angularly return bent to form end tongues engageable behind the adjacent stop pins 11, which tongues are indicated at 27. The bending is accomplished so as to provide flat end portions of the extensions abutting the ends of the stone as shown clearly in Figure 2 whereby the latter is effectively held in the holder. In practice, the holder is completely formed except that an extension at one end is left flat and coextensive with the base of the holder, whereupon the stone is slid longitudinally into the holder and at that end where the extension of the holder is left flat. This normally flat extension is then folded into shape, thereby securely retaining the stone in place. forming the projecting end tongues as integral parts of the metal holder instead of integral with the ends of the stone, a durable construction will be had wherein the objection of breakage of the end tongues and consequent freeing of the stones will be avoided. The fiat end portions of the angularly return bent end extensions of the holders, which abut the ends of the associated stones, are indicated at 28.

Connecting means is-provided to afford a support and a universal driving connection It is obvious that by between the tool and an operating shaft 21, and the same includes a socket member 29 secured at its lower end upon the upper end of the spindle 1 and having the upper portion of the cavity in the upper end thereof shaped to freely receive a ball member 30 piovted upon a transverse axis 31 to the lower end of the operating shaft 21 and provided with opposed lateral pivot pins adapted to be releasably engaged in undercut or bayonet slots 32 provided in the upper end of the socekt members 29. The pivot pins 32 of the ball member 30 are disposed at right angles to the axis of the pivot 31 so that the tool is flexibly supported for substantially universal movement, thereby enabling the tool to properly align with the work irrespective of movement of the operating shaft 21 angularly relative to the axis of the work and the tool. The bayonet slots 33 are so formed that their undercut portions extend in the direction, in which the operating'shaft 21 is turned when the tool is operated, and it will thus be seen that when the pins 30 are entered into the bayonet slots the driving of the shaft 21 automatically effects the connect-ion of the 4 shaft with-the tool, which connection is maintained'as long as the tool is driven. On the other hand, however, a slight'backward rotation of the operating shaft relative to the .tool will result in aligning the pivot pins 32 With the longitudinal portions of the bayonet slots so that the shaft 21 may be readily disengaged from the tool as desired. It is noted, that in operation, the pins 32 will turn about theiraxes in the undercut portions of the bayonet slots 33, thereby enabling swinging of the ball member 31 about a transverse axis at right angles" to the axis 31 about which the shaft 21 is allowed to swing relative to the ball member 30. By reason of this construction, a double ball or full universal joint is had which is detachable from the hone very quickly.

While the several features of the present invention have been specifically shown and described in connection with the form of hone disclosed in my above mentioned patent involving the swinging arms 2, it is nevertheless obvious that the said features are capable of general application to many of the different forms of tools of this class which have heretofore been proposed, involving spaced peripheral and longitudinally extending stick retainers.

Minor changesmay be made without departing from the spirit and scope of the invention as claimed.-

What I claim as new is 1. A cylinder hone embodying a head having a plurality of peripheral longitudinally arranged and radially adjustable recessed members, and a'channelled metallic abrasive stick holder'having an abrasive stick therein and held in the recess of each member and ing a plurality of peripheral longitudinally arranged and radially adj ustable recessed members, channel-shaped metal abrasive stick holders, each having an abrasive stick therein and held in the recesses of said members, stop elements at the ends of the recesses of said recessed members, integral tongues on the ends of said holders engaged behind said stop elements and means within the recessed members to impart yielding outward pressure to said abrasive stick holders.

4. A cylinder hone embodyinga head having a plurality of peripheral longitudinally arranged and radially adjustable recessed members, channel-shaped metal abrasive stick holders, each having an abrasive stick therein and held in the recesses of said members, stop elements at the ends of the recessesof said recessed members, integral tongues on the ends of said holders engaged behind said stop elements, said tongues comprising return-bent end extensions on the ends of the base portions of the channel-shaped holders abutting the ends of the abrasive sticks to prevent longitudinal displacement of the latter in the holders, and means within the recessed members to impart yielding outward pres-- sure to said abrasive stick holders.'

5. An abrading unit for cylinder hones comprising an abrasive stick having longitudinal grooves in the sides thereof, and a channel-shaped metallic holder snugly receiving the abrasive stick and having inturned flanges on the free longitudinal edge portions of the side walls thereof snugly engaged in said side. grooves of the stick and outwardly and inwardly. directed extensions on the ends of the base of the holder engaging the ends of the stick.

6. An abra'dingunit for cylinder hones comprising an abrasive stick having longitudinal grooves in the sides thereof, a channel-shaped metallic holder snugly receiving A the abrasive stick and having inturned free longitudinal edge portions snugly engaged in said side grooves of-the stick, and returnbent extensions. on .the ends of the base of the holder providing projecting. tongues engageable behind end stop'elements of a stick retainer.

7. An abrading unit for cylinder hones 1 comprising an abrasive stick having longitudinal grooves inthe sides thereof, a channel-shap'ed metallic holder snugly receiving 5 the abrasive stick and having inturned free longitudinal edge portions snugly engaged in said side grooves of the stick, and returnbent extensions on the ends of the base of the In testimony-535939221 aflix y gnature;

FRANK EHARTER. 

